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Message-ID: <99db5458-7f91-43d1-96c9-20b22969c6d6@pipping.org>
Date: Tue, 22 Sep 2026 16:56:13 +0200
From: Sebastian Pipping <sebastian@...ping.org>
To: oss-security@...ts.openwall.com
Subject: libexpat 2.8.5 fixes CVE-2026-93990 (malformed UTF-16 smuggling)
Hello oss-security,
just a quick note that libexpat 2.8.5 (or "Expat 2.8.5") released
today is fixing CVE-2026-93990:
Reject high surrogates not followed by a low surrogate during UTF-16
decoding; previously, malformed UTF-16 could be smuggled into the
application using Expat and could cause arbitrary damage there,
depending on how malformed UTF-16 was handled inside the application;
validation was not their job but Expat's. This is similar to past
vulnerability CVE-2022-25235.
Upstream CVSS 3.1 vector:
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (CVSS score: 9.8)
Some key links are:
- The blog post about it
https://blog.hartwork.org/posts/expat-2-8-5-released/
- The change log of release 2.8.5
https://github.com/libexpat/libexpat/blob/R_2_8_5/expat/Changes
- The fixing pull request
https://github.com/libexpat/libexpat/pull/1282
- The NVD CVE metadata
https://nvd.nist.gov/vuln/detail/CVE-2026-93990
(with a different CVSS vector)
Best
Sebastian
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